/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dx.cf.iface;

import com.android.dx.util.FixedSizeList;

/**
 * Standard implementation of {@link AttributeList}, which directly stores an
 * array of {@link Attribute} objects and can be made immutable.
 */
public final class StdAttributeList extends FixedSizeList implements
		AttributeList {

	/**
	 * Constructs an instance. All indices initially contain {@code null}.
	 * 
	 * @param size
	 *            the size of the list
	 */
	public StdAttributeList(int size) {
		super(size);
	}

	/** {@inheritDoc} */
	public Attribute get(int n) {
		return (Attribute) get0(n);
	}

	/** {@inheritDoc} */
	public int byteLength() {
		int sz = size();
		int result = 2; // u2 attributes_count

		for (int i = 0; i < sz; i++) {
			result += get(i).byteLength();
		}

		return result;
	}

	/** {@inheritDoc} */
	public Attribute findFirst(String name) {
		int sz = size();

		for (int i = 0; i < sz; i++) {
			Attribute att = get(i);
			if (att.getName().equals(name)) {
				return att;
			}
		}

		return null;
	}

	/** {@inheritDoc} */
	public Attribute findNext(Attribute attrib) {
		int sz = size();
		int at;

		outer: {
			for (at = 0; at < sz; at++) {
				Attribute att = get(at);
				if (att == attrib) {
					break outer;
				}
			}

			return null;
		}

		String name = attrib.getName();

		for (at++; at < sz; at++) {
			Attribute att = get(at);
			if (att.getName().equals(name)) {
				return att;
			}
		}

		return null;
	}

	/**
	 * Sets the attribute at the given index.
	 * 
	 * @param n
	 *            {@code >= 0, < size();} which attribute
	 * @param attribute
	 *            {@code null-ok;} the attribute object
	 */
	public void set(int n, Attribute attribute) {
		set0(n, attribute);
	}
}
